Abstract: The somatic chromosome numbers and detailed chromosome morphology have been studied in five species and one variety of the genus Ranunculus from China . Their numbers and karyotype formulas are : R . felixii , 2n = 4x = 32 = 12m+ 20sm; R. nephelogenes, 2n = 4x = 32 = 16m + 10sm + 6st ; R. nephelogenes var. geniculatus, 2n = 4x = 32 = 14m + 16sm+ 2st or 2n = 5x= 40 = 18m+ 16sm+ 4st + 2T; R. ficariifolius, 2n = 2x = 16 = 12m+ 2sm + 2st; R. repens, 2n= 2x = 16 = 8m+ 8st or 2n = 4x = 32 = 12m+ 4sm + 14st + 2t; and R. trigonus, 2n = 2x = 16 = 6m + 6sm + 4st, respectively. The chromosome number of R. nephelogenes var. geniculatus and the karyotype of R . nephelogenes var. nephelogenes are reported for the first time. In combination with data from morphology and pollen, the taxonomic implications of the indices of karyological asymmetry in Ranunculus are analysed .

Key words: Ranunculus

摘要： 对国产6 种毛茛属( Ranunculus) 植物进行了核型研究。它们的核型公式分别为: 扇叶毛茛2n = 4x = 32 = 12m + 20sm, 云生毛茛2n = 4x= 32 = 16m+ 10sm+ 6st , 曲升毛茛2n = 4x = 32 = 14m + 16sm+ 2st 及2n = 5x = 40 = 18m + 16sm+ 4st + 2T, 西南毛茛2n = 2x = 16 = 12m+ 2sm + 2st , 匍枝毛茛2n = 2x = 16 = 8m+ 8st 及2n =
4x = 32 = 12m+ 4sm + 14st + 2t , 棱喙毛茛2n = 2x = 16 = 6m + 6sm + 4st。并结合形态及孢粉的资料就毛茛属植物核型不对称系数对分类的意义进行分析。

关键词: 毛茛属, 染色体数目, 核型FONT